Our customer uses the JIRA system for issues, and JIRA has the nice feature of Links - it allows establishing a link in a given ticket (i.e. tic_1) to another related ticket (i.e. tic_2) in a dedicated field on the ticket. There is then a LINK section on the ticket that will show tic_2 (when looking at tic_1), and vice-versa show tic_1 [when looking at tic_2]. this reverse linking is automatically established when the initial link is defined. As the link can be initiated from either ticket, it can also be dropped from either ticket. There is no limit to the number of links to;/from a given ticket. JIRA also provides the feature of specifying the TYPE of relationship between the tickets - i.e. Parent Of/Child of. However this additional information is not critical - simply having the ability to auto-establish bi-direction links b/w tickets is what is useful and desired.
This is basically an extension of what I am proposing to change in mastertickets to add WBS component links. Once there are multiple kinds of edges in the graph, one can have blocks, is-part-of, and related, all with different semantics.
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